Group anchor system, subsea installation system, method for using and installing same

ABSTRACT

Disclosed herein are a group anchor system, subsea installation tool and method of install such group anchor systems. The group anchor system includes a template through which a plurality of vertical piles, such as helical piles, are passed, drilled into the seabed at one end and secured to the template at the other to provide a mooring anchor for an offshore asset. The installation tool is a modular tool designed to mate with the group anchor system. Each module including drive mechanism for engaging and driving a pile. The piles may be driven simultaneously, individually, or in groups as required for proper placement and leveling. Methods of using the installation tool are also disclosed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit of priority to U.S. Provisional PatentApplication Ser. No. 63/209,142 entitled Helical Anchor InstallationSystem, Subsea Installation Tool and Installation Method, which wasfiled on Jun. 10, 2021, which is hereby incorporated by reference in itsentirety.

GOVERNMENT INTEREST

This invention was made with government support under U.S. Department ofEnergy Contract SC0017969 No. 2576. The government has certain rights tothe invention.

FIELD

The present disclosure relates generally to a subsea group anchorsystem, systems and methods for the subsea installation of such subseagroup anchor systems for securing floating and fixed offshore assetsincluding but not limited to offshore energy, offshore renewable energy.

BACKGROUND

Capital expenditure is the greatest cost driver for installation ofoffshore anchors. These include installation of subsea helical piles forwind energy. Thus, this offers the greatest potential to reduce thelevelized cost of energy (LCOE) and make wind energy competitive withother sources of energy. In general, mooring hardware comprises 10% ofcapital expenditure, and 16% in tension leg platforms. Total capitalexpenditure for a wind farm project can be billions of dollars. Mooringcost, therefore, presents a significant opportunity for cost savings.This is especially true on the West coast of the United States, wherewater depths are much deeper and floating turbines (and other offshoreassets) are needed. In the offshore floating wind sector, traditionalanchoring systems use large heavy weights, caissons, driven piles, ordrag embedment anchors to achieve the high-pullout forces required forwind turbine moorings. The high weights and high forces necessaryultimately convert into high costs. These mooring and anchoring optionsare mature, but not necessarily realistic for large wind farms. Thiswill lead to higher than expected costs.

The ability to install low cost group anchors subsea will provide aneffective anchoring system for the offshore energy sector and otheroffshore uses. The present disclosure describes the low-cost, remotesubsea anchor system as well as apparatus and methods for installationof such anchor systems.

SUMMARY

This summary is provided to comply with 37 C.F.R. § 1.73, requiring asummary of the invention briefly indicating the nature and substance ofthe invention. It is submitted with the understanding that it will notbe used to interpret or limit the scope or meaning of the presentdisclosure.

Some embodiments provide an installation tool for installing a groupanchor system, wherein the group anchor system comprises at least twopiles, the installation tool comprising a plurality of installationmodules, wherein each installation module comprises a linear guide railconnecting a top plate to an opposed bottom plate; a driver platformengaging the linear guide rail for movement thereon; wherein the driveplatform includes a drive motor for engaging and driving a pile; a crowddevice for applying vertical force to drive or remove a pile. The linearguide rail may be any suitable device such as a linear rod, pole, bar,or the like. In some embodiments a roller-based drive system, asdescribed below can act as the linear guide rail. The crowd device maybe a motor, linear actuator, or similar device applying vertical force.

In some embodiments, the at least two piles are helical piles, and thedrive motor provides rotational force to drive a helical pile.

Some embodiments further comprise a multi-section installation tubewhich surrounds a shaft of a helical pile, wherein adjacent sections ofthe multi-section installation tube are connected with the drive head ofthe drive motor, such that the installation tool may be driven from anylocation, rather than, or in addition to, from the end. In someinstances, the installation is accomplished via mated lugs in the drivehead and along the length of the installation tube. As depicted in theinset of FIG. 1 , a lower portion of the installation tool is providedwith a way to mate with the lead section of the pile, so that as theinstallation tube is driven, it engages and drives the pile. Here, atoothed arrangement is shown which is useful for driving helical piles.The installation tube provides rigidity to a flexible shaft duringdriving activities. Notably, in addition to the intermediate connectionlugs, and the lead section driver, there may be an additional securinglug (e.g. the exploded portion of the inset in FIG. 1 ). Once a flexiblepile is installed, the installation tube is removed, and the securinglug is brought up, along the flexible shaft, and used to secure theflexible shaft to the template. In an exemplary arrangement, thesecuring lug can travel up the flexible shaft, pass through a collet,and then be rotate so its lugs engage the collet or other surfacethereby securing the pile.

Some embodiments further comprise a rigid shaft, which may be providedwith a plurality of drive lugs along its length for mating with thedrive head of the drive motor, such that the installation tool may bedriven from any drive lug location, rather than from the end.

In some embodiments, the plurality of installation modules may includesany number of modules, up to the number of piles, arranged in apredetermined pattern with respect to each other and each correspondingto a location of a pile to be driven. Some embodiments comprise 2-100modules.

Some embodiments further comprise a control system permitting manual,remote, semi-automatic, or automatic driving of each moduleindependently or simultaneously.

Some embodiments, further provide a plurality of installation tubes, onefor each module; wherein each installation tube comprises two or moreinstallation tube sections connected by a connector with a connectorlug, such that the connector lug can engage with a drive lug such thatthe installation tube can be driven along its length at each connectorlug.

Some embodiments provide a system for installation of one or more piles,wherein the system drives piles into the seabed at intermediate sectionsrather than from the top of the pile, wherein installation of the pilesoccurs subsea at deep ocean depth with subsea tooling. Other embodimentsare used at shallow depths.

Some embodiments provide a method of installing a group anchor systemcomprising two or more piles, comprising: providing a multi-moduleinstallation tool wherein each module comprises a drive head forengaging drive lug for driving a pile into the seabed at intermediatesections rather than from the top of the pile; wherein installation ofthe piles occurs subsea at deep ocean depth with subsea tooling. Otherembodiments are used at shallow depths.

In some embodiments, the one or more piles are helical piles.

In some embodiments, each module comprises: torque heads driven bymotors (such as hydraulic or electric motors, linear actuators (piston,bar linkage, etc), motors attached drive to acme rods (or other linearrod) providing downward force, and

various monitoring sensors such as torque, force, speed, position.

Some embodiments comprise an automated installation process.

Some embodiments comprise a user-controlled installation process.

In some embodiments, each module may be operated simultaneously orindependently, or in group to facilitate leveling of the group anchorsystem.

Some embodiments provide a group anchor system comprising a plurality ofvertical piles; a template, wherein the template defines an aperture foreach of the plurality of vertical piles allowing the vertical pile topass there through and to be secured therein; and one or more mooringconnections.

Some embodiments comprise a skirt fixed to the perimeter of the templateand extending therefrom towards and into the seabed.

In some embodiments, the skirt extends either perpendicularly, or at anoutward angle from the template.

In some embodiments, one or more of the plurality of vertical pilesfurther comprises an inner skirt, associated therewith. These innerskirts may be attached rigidly or flexible to the template and primaryskirt.

In some embodiments, each vertical pile is a helical pile.

Some embodiments will be connected to the group anchor on a surfacevessel.

Both the embodiment and group anchor would be lowered to the seafloortogether by the vessel LARS (Launch and recovery system), crane, orA-lowering frame or by a unique anchor and tool system LARS, includingcrane on vessel or separate specific LARS.

Some embodiments will perform self-leveling if needed.

Some embodiments will initially install a subset of piles to a shortembedment depth. For example, 1-10 piles could be partially installed to“seat” the anchor system before it is fully secured.

Some embodiments will activate other units until all helical piles areinitially installed.

During initial installation, the skirt will self-install or withadditional methods provided by the installation tool into the ground bythe system weight and helical pile pull in force.

Some embodiments will continue to install all helical piles to therequired embedment depth by installing sections of the helical pile'slength. This process of installing shorter sections will continue untilthe full required length is completed.

Once all the helical piles reach the required embedment depth, the toolcould remove the drive shaft, then lock the helical piles into theanchor template.

After the skirt is fully installed and all helical piles are locked intothe template some embodiments will release the installation tool andreturn back to the surface vessel.

Some embodiments provide an offshore anchor system comprising two ormore helical anchors, each having a predetermined length; and a templateacting as a base to locate the helical anchors at a prescribed distancefor installation.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and form a part ofthe specification, illustrate the embodiments of the invention andtogether with the written description serve to explain the principles,characteristics, and features of some embodiments of the invention. Inthe drawings:

FIGS. 1-8 show an exemplary helical pile system and the installationequipment and methodology of the installation tool. The self-levelingfeet are removed for picture clarity.

FIG. 1 is a perspective view of a group anchor system and installationtool in accordance with some embodiments, including an insert showing anexemplary drive lug.

FIG. 2 is a partial cut-away view of a group anchor system in accordancewith some inventions.

FIG. 3 depicts an exemplary collar receiver weldment for securing a pileto a template.

FIG. 4 is an alternative view of a group anchor system in accordancewith some embodiments, particularly show multiple mooring connections.

FIG. 5 depicts a flexible pile, particularly a helical pile having aflexible shaft.

FIG. 6 depicts an embodiment of the group anchor system employingmultiple skirts.

FIG. 7 shows an exemplary installation tool including a plurality ofinstallation modules.

FIG. 8 depicts an exemplary installation module.

FIG. 9 depicts an exemplary moving platform in accordance with FIG. 8 .

FIG. 10 is a depiction of exemplary mated parts of a lugged drive.

FIG. 11 depicts an alternative drive mechanism comprising rollers forgrasping the side of pile shaft to drive it into or out of the seabed.

FIG. 12 shows the Tool connected to the group anchor prior toinstallation.

FIG. 13 shows the tool starting to install helical piles.

FIG. 14 shows all helical piles being driven into the ground

FIG. 15 shows the continued installation of helical piles

FIG. 16 shows the stage where all individual helical piles have beeninstalled to maximum embedment length

FIG. 17 shows how shaft portions are pulled out leaving the helicalplate embedded (if using flexible anchors only)

FIG. 18 shows how all drive shafts are removed (if using flexibleanchors only)

FIG. 19 shows how the tool disconnects from the group anchor to leavebehind for mooring connection

DETAILED DESCRIPTION

This disclosure is not limited to the particular apparatus, systems,devices and methods described, as these may vary. The terminology usedin the description is for the purpose of describing the particularversions or embodiments only, and is not intended to limit the scope.

The present disclosure describes a group anchoring system, designed foroffshore assets, keeping in mind economic drivers such as manufacturing,transport, installation, and the benefits of mass production. The groupanchor system and installation tool are useful for an offshore asset,such as wind farms, other floating renewable energy, aquacultureenclosures, manned submersibles, unmanned submersibles, buoys,monitoring buoys, turbine, fixed turbine, subsea cable, non-floatingsubsea infrastructure, or any other offshore asset. Some embodiments arebased on highly efficient helical piles that will reduce LCOE. Itconsists of an anchor and installation tool that solves the traditionalchallenges with installing these anchors subsea. Although it will beappreciated that the installation tool may be re-used with additionalgroup anchor systems such that the same tool may be used to installmultiple group anchor systems over time. Lower manufacturing costs ofthe group anchor system, faster installation times, lower noise for thesubsea tool over a driven pile hammer are just a few of the benefits.

In the following description, for purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of example embodiments. It will be evident to one skilledin the art, however, that embodiments can be practiced without thesespecific details. For example, this disclosure focuses on the use ofhelical piles in the group anchor system, but other anchor or pilesystems may be used. For clarity, the terms “helical anchor” and“helical pile” are synonymous. For the purposes of this disclosure, wehave chosen to use the term “helical pile” to designate a specific pileand “anchor” or “anchor system” to designate the entire group anchorsystem. The helical pile system is chosen herein for discussion becauseit is well-suited for the applications described herein, and has thebenefits of providing additional horizontal holding capacity to theskirt due to minimized skirt rotation, can provide greater capacity thansingle helical piles, and installation of the helical piles is virtuallysilent and is biologically friendly.

While various illustrative embodiments incorporating the principles ofthe present teachings have been disclosed, the present teachings are notlimited to the disclosed embodiments. Instead, this application isintended to cover any variations, uses, or adaptations of the presentteachings and use its general principles without deviating from thescope and spirit of this disclosure. Further, this application isintended to cover such departures from the present disclosure that arewithin known or customary practice in the art to which these teachingspertain.

In the detailed description, reference is made to the accompanyingdrawings, which form a part hereof In the drawings, similar symbolstypically identify similar components, unless context dictatesotherwise. The illustrative embodiments described in the presentdisclosure are not meant to be limiting. Other embodiments may be used,and other changes may be made, without departing from the spirit orscope of the subject matter presented herein. It will be readilyunderstood that various features of the present disclosure, as generallydescribed herein, and illustrated in the Figures, can be arranged,substituted, combined, separated, and designed in a wide variety ofdifferent configurations, all of which are explicitly contemplatedherein.

Prior approaches to subsea installation of helical piles at deep oceandepth involve installation from the surface with vessel mountedequipment, and such approaches are not suitable for deep ocean depths.Prior approaches do not install multiple helical piles at deep oceandepth with subsea tooling. The present disclosure provides a method toapply both torque and downward force to install helical piles at deepocean depth. Some embodiments are used at shallow depths or on land.

The group anchor system and installation tool described herein arewell-suited and easily adapted for use in all depths, including shallowdepth installations and deep depth installations. As used herein,“shallow depth” means under 50 feet, and “deep depth” means over 50feet.

There are two main ways for installation of helical piles offshore: (1)use land based helical pile construction machinery aboard a vessel orjack-up rig, or (2) use custom offshore equipment aboard a vessel orjack-up rig.

Neither of these options provides a subsea installation tool to installmultiple helical piles. The solution disclosed herein allows for thesimultaneous installation of two or more piles in a group anchor system.Existing solutions, require serial installation of multiple piles whenpresent. In some embodiments, all piles of the group anchor system maybe driven at the same time. The present disclosure provides acost-effective solution to install helical piles subsea at low cost withthe use of standard offshore vessel spreads.

The Group Anchor System

In some embodiments, the group anchor system is one such as described inU.S. patent application Ser. No. 17/101,978 entitled Helical AnchorGroup Installation System filed on Nov. 23, 2020, which is herebyincorporated by reference in its entirety. Such group anchor systems usemultiple small helical piles, a template, and an optional skirt toprovide the uplift and lateral capacities required to moor a floatingwind platform.

Based on the concept of modularity, the group anchor system is designedfor efficient manufacturing and transportation. Each component of theanchor, including the skirt, template, helical pile, lead section,collars, mooring connection base, are manufactured separately asindividual components. The innovative modular connection methodologyallows each component to be interchanged with another without having toredesign the entire structure.

An improved group anchoring system, as disclosed herein and showngenerically in FIGS. 2 and 4 , comprised of modular components that whenassembled, provides more capacity than apart.

The group anchor system 100 includes a plurality of vertical piles 130,such as helical piles, connected to a template 120. An embedded,optional skirt 110 fixed to the perimeter of the template 120 can beused to increase lateral load capacity. A mooring line (not shown) isattached to the template 120 by a mooring line connector 160. Any of avariety of methods, such as a padeye connection or a welded or flangedball and socket style connector. The mooring line eventually connectsthe group anchor system 100 to the offshore asset. As a practical designapproach, it is assumed that the vertical (tensile) component of themooring load will be primarily resisted by the vertical piles and thelateral load component will be primarily resisted by the perimeterskirt. As such, the skirt is not a required component of the anchor.

The Helical Piles

FIG. 2 depicts an exemplary helical pile 130. Each helical pile 130comprises a lead section 140, comprising at least one helical plate 142mounted on a rigid lead 146, a clevis 144, with drive lug 145, and ashaft 132. The clevis 144 affixes the lead section 140 to the shaft 132,and may take various forms depending on the type of lead and type ofshaft. The drive lug 145 enables the installation tool 500 to engage anddrive the helical pile 130, as described further below. The shaft 132may be rigid or flexible. FIG. 5 depicts a flexible shaft in the form ofa wire rope assembly. Each helical pile shaft 120 can be round ormultisided (such as, but not limited to, 3 to 8 sides), solid or hollowshaft from the deep embedded plate to the template or a “flexible” shaftof any length (such as but not limited to 10-150 feet). The flexibleshaft is achieved by a wire or synthetic rope from the lead section tothe template or two or more rigid shaft sections connected by a flexiblejoint (not shown). A flexible shaft allows decoupling ofvertical/horizontal loading to improve overall performance. Thisflexible shaft 132 can be made up of cable, synthetic rope, chain,multiple rigid shafts connected via one or more flexible joints, or acombination of two or more.

Each group anchor system may include a plurality of helical piles 130such as 2 to 100 piles. The number of piles is chosen based upon theneeds of a particular site, including but not limited to soil type,mooring load, depth, anchor type, size and shape of the template, etc.The helical piles may be arranged randomly or in a pattern. In someembodiments, the helical piles will be arranged about the periphery ofthe template. In some embodiments, the helical piles are arranged evenlyto allow for even pressure and holding power.

Each pile may be of identical, similar, or different construction fromthe other piles. As will be appreciated from further reading of thisspecification, different pile structures are possible since theinstallation tool is module, and each module can be adapted to thecharacteristics of the pile driven by that module. The length of eachpile can be identical or can vary between piles in the system, e.g., asingle system could have 10 piles at 30 feet and 10 piles at 40 feet.

The number of plates in a helical pile can vary between piles in asystem. For example, the system could have 10 piles with 2 plates and 10piles with 1 plate.

Combinations of different lengths, different number of plates, differentdiameter plates can be used to optimize the system at different siteconditions.

Each helical plate can be installed to any depth within the sea floor,and the length of the overall helical pile can be any length within therange above (about 10 to about 100 feet) as securement to the templatecan be provided by a swage, collet, connecting chain links or othermethods. Piles within a group may be installed to a variety of depths toachieve design goals. This arrangement allows for the length of thepiles to be adjusted as needed. For example, a pile can “let out” a bitin or “taken in” as needed.

The pile tip of each helical pile 140 includes at least one helicalplate 142. Each helical plate 142 may include one or more turns (forexample 1 to 5) for softer soils or utilizes a drill bit for rockysoils. Similarly, each helical pile may employ more than one plate. Forexample, 1-3 plates, each having 1-5 turns, may be used. The pile tipmay include a sharp cutting edge, serrated edge, smaller helix, drillbit, a bulbous shaped extrusion, or other shape to aid penetration.

In some embodiments, the pile tip can flare out after install for lowtorque during installation and large area for holding force afterinstall. This flaring, i.e. increase in horizontal area, can be achievedby folding plates that extend when pulled upwards, plates that extendout when the pile is rotated in the opposite direction, or by othermeans.

Additionally, tensioning devices such as springs, lock washers, cablestretch, or an installation system that adds tension with final turnscan be used to put the helical piles in tension and distribute load onceinstalled. That is, once in place, a final adjustment can be made toachieve the desired tension. A ratcheting or cam mechanism could be usedsuch that any relative motion between pile and anchor would result intightening.

The helical piles provide additional resistance to the skirt to resistmovement and provide additional capacity over only an embedded skirt.For example, specifically placed helical piles can resist rotationresulting in higher horizontal capacity.

For multi-plate helical piles, the plates are typically spacedvertically at a distance of at least 3 times the diameter to minimizeinteractions between adjacent plates.

Leveling of the template and anchor system is achieved by monitoringangle during helical pile installation and adjusting pile motion tomaintain desired angle. Although the installation tool allows formultiple or all piles to be driven simultaneously, the drive rate ofindividual piles can be adjusted to accommodate site differences and forleveling or other purposes.

The helical piles provide the majority of the uplift capacity for thesystem. Helical piles are installed by applying torque and crowd (downforce) and screwing them into the seabed. Based on the site-specificsoil conditions, the helical piles style, size and length will bedetermined for the optimal performance. Each helical pile comprises of ashaft, and a helical plate. Shaft lengths may range from approximately5-100 feet or longer and may be made from multiple sections connected bycouplers. The helical plate is designed and positioned such thattwisting the anchor forces the shaft downward into the seabed. Multiplepiles may be employed in a single anchor system held together via thetemplate. Piles within a group may have the same or different platediameter, shaft diameter, depth, and other independent characteristicsthrough system modularity. The piles themselves maybe in pre-arrangedlocations or positions. The arrangement may be symmetrical orasymmetrical. In some instances, they are closely space, i.e. less than5 diameters apparat from one another.

Commercial off the shelf (COTS) helical pile lead sections and shaftsmay be used. Shafts are either rigid or flexible and can range indiameter from 0.5″ to 8″. Helical lead sections are comprised of atleast one helix in diameters ranging from 4″ to 36″. These sizes areexemplary and may be larger or smaller depending upon the application.Utilization of flexible shafts between the template connection and thehelical pile lead section is innovative in that it decouples the skirtfrom the helices.

This design ensures the shafts are not at risk of buckling due tocompressive loading or deformed due to bending moment.

The helical piles serve as the primary vertical load capacity. Theinnovative use of groups of helical piles in predetermined fixedlocations, in combination with a template and skirt achieves requiredcapacity as a group.

The tool and anchor are lowered to the seafloor as one unit, the helicalpiles are pre-assembled in the template and installation tool. The toolinstalls the anchor and releases afterward to come back to the surfacefor reloading of the next anchor.

The Template

The template 120 is a base platform that holds all the helical piles 130together and provides a mooring connection 160 for the floating platformor to which the rigid components are connected. The template 120 alsoprovides the base for the subsea tool 500 to sit on while each pile isinstalled. The template 120 is provided with a plurality of apertures,each of which is designed to accept and allow a helical pile 130, shaft132, and installation tool 520 pass there through. This feature allowsnot only for easy install of a helical piles, but should one need to bereplaced, an individual pile can be removed, without having to removethe entire template 120. The apertures can be positioned at strategiclocations on the template, based on the particular site geography, orgenerically (e.g. such as along the periphery of the template). Tocomplete installation, each helical pile can be secured to the templatewithin its respective aperture by a decoupler to allow for securing thepile but also allowing subsequent removal, for example by a collarreceiver weldment 154 and collar 152 (see FIG. 3 ). The receiverweldment is a feature that allows load transfer from the template topile, and can be used to lock a pile to prevent uplit or allow piles tomove independently. In some embodiments, the aperture (i.e. a templateinterface) may be a steel lined bore. The template will provide someuplift and lateral capacities but compared to the overall system willhave relatively small benefits. The main purpose of the template is toprovide stability and load transfer among helical piles, template, andskirt and to the mooring connection point.

The template can support single or multi-mooring connection points. Thetemplate can distribute load to one or more mooring attachments and/or abridle can be utilized to distribute load. Single or multipointconnections could be sliding/rotating attachments involving pulleys,bushings that slide on a shaft, etc. Mooring connections may be in planewith the template or above or below the template.

The template is not merely an anchor plate for attaching piles andmooring lines. The template defines a plurality of apertures throughwhich each helical pile passes through. Each aperture is placed at apredetermined location with intentional spacing between apertures, thuscreating intentional spacing between piles. Unlike traditional anchorplates, the template provides a guide for installing the piles. Indeed,unlike other systems, the template makes contact with the seabead, andthe piles are driven through the template into the seafloor and thensecured to the template. The piles can be distributed in anyarrangement, including but not limited to even spacing; symmetryprovides benefits. Helical piles can be installed directly down from thetemplate or off at any number of specified angles to improve capacity orotherwise affect performance characteristics. Individual piles maybe atidentical, similar, or different angles, depending on the needs of thesite. Helical piles may be assembled into the template with the helicalplate below the template such that only the shaft passes through or theplate may be driven through the template using specially designedhelical apertures that allow the plate to pass through while maintaintight shaft location control. The aperture may consist of angled orstraight slots or other openings to allow the helical plate to passthrough vertically or while turning. The openings may be fixed in placeor may slide or flex rotationally or translationally, in plane, or outof plane to allow the plate to pass. A large aperture could allow thehelix to pass through and then be reduced to hold the shaft tightly witha plug or other means. The plug could be mounted on the pile shaft abovethe helical plate.

The template can be made of any material including metal, concrete, orsynthetic and fabricated in any configuration including trusswork,webbing, framing, solid plate, multiple plates, or layered sheets orbeams.

Suction can be applied to the skirt and template in addition to thehelical piles to increase capacity or aid installation, for example inclay soils.

The template comprises a base portion that may be made of any suitablematerial, such as, but not limited to concrete and/or metal. Thetemplate engages and connects each of the multiple anchors together as asystem. The template and anchors may be transported separately andassembled in place, making the system easy to transport, use, andinstall, as well as making it scalable depending on site needs. Thetemplate comprises a base portion that may be made of any suitablematerial, such as, but not limited to concrete and/or metal. Thetemplate engages and connects each of the multiple anchors together as asystem. The template and anchors may be transported separately andassembled in place, making the system easy to transport, use, andinstall, as well as making it scalable depending on site needs. Thesystem can be shipped disassembled to the installation site andassembled on deck or under water, depending on need.

The template is manufactured into either a truss framework or of a solidplate or a combination of both. The template secures the helical pilesto the skirt and to the mooring connection. The template predefines thehelical pile locations in proximity to each other and to the skirt andthe mooring connection point. The template is also designed as athrough-connection point for the helical piles. The helical piles,template, and skirt are installed together as one unit with the helicalpiles through-template position as the innovative design. The top centerof the template is adaptable to a multitude of connection types that areused across the mooring industry including a trunnion, padeye, and aball and socket.

Trunnions or padeyes will be directly welded to the template center. Aball and socket connected can either be mechanically secured to thetemplate structure via welding, bolted flange, or integrated permanentlythrough the template support structure.

The Skirt

In some embodiments, a skirt 120 is provided to increase lateralcapacity of the system and for other purposes. The skirt 120 generallyprojects towards and through the seabed from the outer periphery of thetemplate. The skirt may be integrally formed with the template or may beattached separately. The skirt and template together form a hollowstructure which is embedded into the seabed.

The skirt comprises an exterior shell ranging in size and thicknessattached to the circumference of the template, made of suitable materialwhich includes but is not limited to metal, polymer, or concrete. Suchsystems can include a “skirt”, and the skirt will be self-installing bythe helical piles. The skirt is installed such that it is embedded intothe seabed. In some instances, the skirt extends at least as deep as thehelical pile. The length of the skirt (i.e. depth to which it isembedded) depends on the use as well as site conditions. In someinstances, the skirt length is less than the depth to which the helicalpile is installed. In some instances, the skirt length is greater thanthe depth to which the helical pile is installed. In some instances, theskirt length and the depth to which the helical pile is installed arenearly identical. In some instances, the skirt length is 10%, 20%, 30%,40%, 50%, 60%, 70%, 80%, 90%, or 100% of the depth to which the helicalpile is installed. In some embodiments, the length may be up to 1000%larger. The length may be any of these or a range between any two ofthese values. The skirt may follow the geometry of the template, andthus may be circular, triangular, polygonal, cone, pyramid, cross, orcylindrical shell in nature. Any shape may be used depending on theneeds of the site and the application. In some embodiments, the anchorsystem employs flexible shafts (e.g. rope, wire, etc.) that connect fromthe template to the helical plate. In other embodiments, the anchorsystem employs rigid, hollow or solid, shafts having any suitablecross-section but particularly circular, square, star, or hexagonalshape. In some embodiments each of the helical piles may independentlycomprise a single plate or multiple plate configuration.

The skirt is manufactured by either a roller similar to caissontechnology or in multiple sides that are welded or bolted together ormade by casting or other means. The polygonal skirt is comprised of 3 ormore sides concentric about the center. Each side is either flat,curved, or corrugated. A single plate of steel can also be bent intomultiple sides before being welded to the additional skirt panels. Theskirt is manufactured with a through-hull access point for deck-fit upand transportation. When the skirt is manufactured by a steel roller/isdesigned in a cylindrical fashion, it is modeled and behaves like acylindrical shell (High diameter over thickness ratios D/t). This ispossible due to the innovative installation method

reducing or eliminating driving or negative pressure forces duringinstallation thus keeping the skirt, and therefore the entire anchor,lightweight.

The skirt can be one large exterior diameter of the full system or canbe on each individual helical pile.

Additionally, the skirt can be circular or made up of multiple flat orcurved sides (3 or more sides) or even consist of flat plates that crossto form an X or other shape as long as the create a vertical bearingsurface. The skirt may be solid or include openings or separatesections. The sides can be perforated, staves, or expanded metal.

The skirt can extend straight down vertically or at an angle. It canalso include a difference in thickness and nonuniform shape at the tipincluding a sharp cutting edge, serrated edge, or a bulbous shapedextrusion to aid penetration or for other purposes.

Length of the skirt can be 10% of the template diameter up to 1000% ofthe template diameter.

Within the skirt, internal bracing, ribs, and bulkheads can be includedfor strength.

Embedment of the skirt is performed by either self-weight, jetting,suction, vibration, or using the helical piles as a method for “jacking”to pull the skirt into the soil. The helical piles would be used as areaction platform with the installation tool providing the jackingforce.

To reach full embedment, the installation forces must be equal to orgreater than the soil resistance which is a comprised of the tip bearingcapacity and the side friction of the skirt. Helical piles are theprimary method in installing the skirt component of the anchor. Notethat the helical piles can be removed after skirt installation withoutaffecting the skirt. Thus the skirt and/or template could be left behindas the anchor if desired. The top of the skirt could be closed or open,a closed top provides additional holding force. The piles are installedto the necessary depth using the installation tool, and then used as areaction force as the installation tool provides upward force (oppositeof what is used to install the helical piles) on the piles andconsequential downwards force on the perimeter of the skirt. Thedownward force on the perimeter of the skirt is quantified using soilmechanics and foundation engineering fundamentals and used in design andinstallation analyses of the system.

Extending flaps that resist vertical, rotational, and/or horizontalloading can be included on the skirt to expand once under tension toprovide additional holding capacity without increasing installationforces.

In some embodiments, such as shown in FIG. 9 , multiple “mini” skirts111 may be employed. As shown in FIG. 9 , each helical pile 130 includesits own inner skirt 111 and a larger skirt 120 is provided around theentire array of helical piles. In some embodiments, one or more of thehelical piles may be provided with a skirt and a second, outer skirt isprovided around the entire anchor array. In other embodiments (notshown), two or more helical piles may each be provided with its ownskirt of any size.

The group anchor system, including a skirt can be installed by drivingthe piles through the template and into the seabed, thereby pulling theskirt into the seabed. In some embodiments, the piles may then beremoved, using the skirt, alone, to hold the template and anchor systemin place.

The Installation Tool

The tool drives from the anchor connectors in the middle portions of theanchor sections or by gripping the anchor shaft.

The system is innovative because it provides both measured crowd andtorque to the anchor to provide a smoother more effective install andprovide holding force information. By collecting installation forces,in-situ capacity can be determined without proof testing of theanchoring system. The system drives the helical pile into the groundfrom middle connecting sections while the full pile is alreadyassembled. It is done without a user controlling hydraulic motors with ahand lever. It is done with a remotely automated software program usingtorque/crowd and advancement rate as feedback.

It is also possible to move one or more drive heads between anchorsrather than having one drive head per anchor. Likewise the system couldin some cases push from the top of the anchor rather than the center.The piles can be pre-assembled, but they could also be assembled fromsections during installation by the robotic mechanism.

The installation tool is made up of a number of parts, many of which areused in their conventional manner and are not fully described herein.The installation tool may include one or more of a subsea hydraulicpower unit, subsea communication bottles, offshore rated supportstructure/lifting points, self-leveling legs, anchordisconnection/alignment guides, and modular drive train systemscomprising: torque heads driven by hydraulic motors, guide rails, acmerods (or screws) driven by hydraulic motors providing downward force,and various monitoring sensors. The tool is made up of purchased andmachined parts, substantially metal construction with motors, bearings,location/pressure/torque sensors, bearings, acme rods, guide rods,linear actuators.

To install the anchor system, the system utilizes a special installationtool 500 that is quick connected to the template 120 and helical piles130 during installation and disconnected afterwards remotely. The tool500 is modular and includes several tool modules 501 with drivers 550which provide torque and crowd to install the piles 130. The modules 501can push down, up and rotate the helical piles 130. These modules 501coincide with the locations of the piles in the template 120, with onemodule per pile. The modules can be controlled independently allowingfor one or more piles to be installed simultaneously or drivenindependently or even backdriven for example to level the anchor systemor control installation angle. Each module is interchangeable allowingfor quick replacement if a module was to malfunction. Alternatively asingle drive unit or a smaller number of drive units could be used witha mechanism to move the drive units between piles, but the most benefitis achieved when multiple piles can be driven simultaneously.

The modules 501 can drive the helical piles 130 by gripping the pile atany location or via connectors at midpoints along the pile shaft or atthe ends. Existing systems typically drive pile from the upper end ofthe pile. These connectors can create a smooth continuous shaft surfaceor have a lugged geometry which the drive head can interfaces with totransmit both multidirectional crowd and torque to the pile. The moduledrives each connector in series moving from one to the another drivingthe pile into the ground in sections. The module and drive head arecapable of driving the connectors and piles in both directions enablingthe tool to both install and extract the piles. The drive head and pileshaft connectors mate with each other so that the drive lug can turn theshaft, which in turn drives the helical plate. Pile shaft connectors andlugs are placed along the length of the installation tube, typicallyconnecting adjacent and shorter lengths of installation tube sections.Lugs may include a pin, hole, spline, faced section with one or moreflat surfaces, grooves, or other mechanical interfaces to aidtranslational and rotational force transfer.

In addition to the lugged drive head the tool modules could also utilizea roller based drive head. The roller based drive head eliminates theneed for connectors and can drive the pile at any point along itslength. This approach uses toothed/knurled rollers to grip the exteriorof the helical pile. These rollers are driven to transfer torque andcrowd to the pile. Two or more sets of rollers engage the shaft of thehelical pile too drive the pile into the ground. One or more of thesesets are perpendicular to the axis of the pile when these rollers turncrowd force if provided to the pile. One or more rollers are positionedparallel to the axis of the pile, when these are driven, torque isapplied to the shaft. In order to provide adequate force between therollers and the shaft, to accommodate multiple shaft sizes, and to makeway for upsets in the shaft, the rollers can be actuated toward and awayfrom the pile. The roller is capable of being driven in both directionsenabling the pile to be driven in both directions facilitating bothinstallation and extraction.

The number of modules matches the number of helical piles in the anchor.There is no limit to the number of modules. The spacing of the helicalpiles allows for drive modules to be placed at the correct locations.The modules include attachment points that allow them to be assembled toeach other such that modules can be added or removed as needed.

The tool, including its multiple modules is approximately the samediameter, or dimension, as the anchor. The height is dependent on thelength of anchor sections used based on the crane height available forinstallation, 10-30 feet tall tool. The helical piles will stick out ofthe top of the tool.

Sensors are on all the hydraulic motors, top and bottom of the moduletravel and on the drive mechanism. The sensors monitor position, speed,torque, force, angle, etc. to support monitoring and autonomous or semiautonomous operation.

The tool can install preassembled piles or assembly the piles duringinstallation.

The tool features an exoskeleton that is designed to hold the modularunits together with the anchor and keep piles aligned. The exoskeletonis comprised of truss and lattice work that serves as the main handlingcomponent of the anchor system. Rigging is secured to this structure forlifting and sliding.

The exoskeleton is designed to support the weight of the tool and theanchor in the vertical and horizontal orientations or during rotationfrom horizontal to vertical and vertical to horizontal. Assembly ofpiles, template, and other tool components with the exoskeleton mayoccur while horizontal or vertical.

This exoskeleton gives the anchor the ability to be handled by a crane,deck tuggers, or by winches. It also gives the ability for the tool andanchor to be deployed over a stern roller or a point on the vessel wherethe anchor will rotate about during overboarding or righting.

The modular tools feature alignment pins for easy assembly andconnection to the anchor.

The tool can be attached to the anchor out of the water and in thewater. Additionally, the tool can detach from the anchor out of thewater and in the water.

The main driving units of the tool can either be hydraulics orelectrical power. Power units can either be contained within the tool,separate but subsea, or on the surface and interfacing through atether/umbilical.

Some embodiments convert electrical power subsea from thetether/umbilical into hydraulic power to use to install the helicalgroup anchoring system. Some embodiments will also communicate over thetether/umbilical. The present disclosure will provide both torque andforce to install the helical piles.

Some embodiments will include a subsea hydraulic power unit, subseacommunication bottles, offshore rated support structure/lifting points,self-leveling legs, anchor disconnection/alignment guides, and modulardrive train systems consisting of: torque heads driven by hydraulicmotors, acme rods (or screws) driven by hydraulic motors providingdownward force, and various monitoring sensors.

Some embodiments will drive the anchors into the seabed at intermediatesections rather than from the top of the helical pile. The intermediatesections could be 5-20 foot long sections, with a total installationlength of over 100 feet or as little as 5 feet. Installation length willbe determined by the site-specific conditions. The drive systemcombining the torque and force methods will be on a modular scalableunit to accommodate any size helical pile and different group sizes.

Some embodiments will have the ability to install multiple helical pilesat the same time into the seabed. The other helical piles will providecounter torque to the pile or piles being installed.

Depending on the seafloor conditions, some embodiments could includeself-leveling legs. The legs will provide additional support for landout and initial installation while the helical piles have installed to adepth that is sufficient for further installation without the legs. Theself-leveling legs will provide the ability to install the anchor levelto the loading path. The self-leveling legs will also provide an initialcounter torque reaction point for the initial helical pile installation.

Some embodiments will have the ability to install both standard rigidhelical piles and flexible helical piles. In the case of flexiblehelical piles, the tool will pull out the installation string, leavingonly the helical plate and the flexible shaft (e.g. wire, rope, chain,rigid rods with hinges, etc.) behind for connection. A combination ofrigid and flexible may be used.

Some embodiments will provide feedback to the user on the surfacevessel. Some embodiments will have automated and user-controlledinstallation process based on unit feedback from sensors.

FIG. 1 is a perspective view of an installation tool, and groupanchoring system in accordance with embodiments herein, the inset showsa installation tube connector with drive lug.

FIG. 2 is a perspective view of a group anchor system in accordance withsome embodiments with skirt shown in partial cut-away.

FIG. 3 is an exploded view of a receiver weldment in accordance withsome embodiments.

FIG. 4 is an alternative embodiment of an anchor system in accordancewith some embodiments.

FIG. 5 depicts a helical pile with a flexible shaft.

FIG. 6 depicts a perspective, underside view of a group anchor systememploying inner and outer skirts, affixed to the installation tool.

FIG. 7 is a perspective view of an installation tool in accordance withsome embodiments.

FIG. 8 depicts a module of an installation tool in accordance with someembodiments.

FIG. 9 depicts the moving platform of a module of FIG. 8 .

FIG. 10 depicts the shaft connect lug and the drive head as well astheir interrelation during driving action.

FIG. 11 depicts an alternative roller based drive mechanism.

FIGS. 12-19 show an exemplary helical pile system 100 and theinstallation tool 500 and methodology of the installation tool. Optionalfeatures, such as self-leveling feet are removed for picture clarity.

FIG. 12 shows the installation tool connected to the group anchor systemprior to installation. The installation tool 500 includes exoskeletonframe 510, a plurality of drilling shafts 520, each of which comprisesmultiple components (520 a, 520 b) to achieve the desired length. Theanchor line 132 is allowed to pass within the drilling shaft 520. FIGS.2-8 illustrate the installation process. In some embodiments, the anchorsystem 100, is embedded in the seafloor, such that the skirt 110 isembedded below the seabed floor, and the anchor template 120 engages theseafloor. The template may also be embedded below the seafloor in somecases. The helical piles 130 are embedded in the seafloor to the desireddepth depending on the application and the site conditions.

FIGS. 13-15 show the drilling shafts of the tool moving downward, and itdrives the helical piles 130 into the seabed. In each successive figure,the drilling shafts have moved downward, as have the helical piles 130.FIG. 15 continues this movement, with the drilling shafts being obscuredfrom view by the exoskeleton 510. FIG. 16 where all individual helicalpiles have been installed to maximum embedment length. Importantly, thesystem allows for each individual pile to be driven independently,meaning they all could be driven to the same depth as shown, or somecould be drive to shorter lengths to accommodate site conditions.Further, driving each pile may be stopped at any point during pileinstall and the pile may be bound to the template at that point. Thatis, the length of the pile could be predetermined or dynamicallydetermined during install.

FIG. 16 shows a fully installed pile just prior to beginning removal ofthe installation tool.

FIG. 17 shows how drilling shaft portions are pulled upward, leaving thehelical plate embedded (in the case of flexible anchors as shown).

FIG. 18 shows all drilling shafts removed (if using flexible anchorsonly).

Finally, FIG. 19 shows the installation tool 500 disconnected andremoved anchor system 100 to leave behind for mooring connection viaconnector 140.

Although the figures depict removal of the installation tool, leavingthe flexible piles behind attached to the template, in some embodiments,the helical piles may be used to pull the template and skirt intoposition to the desired depth, and the piles may be removed along withthe installation tool, by reversing the operation, to leave only thetemplate and skirt behind.

Transportation & Fit-Up

Unique to the anchoring system is the transportability of eachcomponent. The tool, skirt & template, and helical piles are sentoffshore separately. The tool(s) is onboard the installation vesselduring operations. The skirts and template are combined onshore andtransported offshore by either the installation vessel or a supplyvessel or a barge. Skirts can be stacked on top of one another withoutthe need for welding or bolted connections. By stacking skirts, moreanchors can be transport offshore per vessel reducing emissions, time,and costs.

Helical piles are transported onshore and offshore in components andassembled offshore with the tool before deployment. Helical leadsections are transported on racks and helical piles in open-topcontainers.

During offshore deployment, the helical lead sections are set in ahelical pile deck template. Then, the skirt is set on the installationvessel's work deck on in a skirt cradle. Mooring connection leads areconnected to the skirt. The tool is lowered onto the skirt and engagesthe quick connectors locking the tool to the skirt.

Inside the skirt, the deck template working platform with lead sectioncradles is raised to the bottom of the template, inside and at the topof the skirt by actuators (hydraulic or electric). With the leadsections fixed to the helical piles in the skirt, the deck template islowered back to deck and the structure is ready for deployment.

Overboarding & Installation

The tool 500 and anchor system 100 are deployed subsea together. Thesystem is lowered to the seafloor as one unit via the vessel/bargecrane, anchor winch, frame, or a system specific LARS.

To assist positioning and anchor orientation, the systems sensors,cameras, and thrusters can be utilized via tether or through ROVinterface. The tool can be operated through a control panel via remotelyoperated vehicle (ROV) interface. Once the ROV is stabbed into the tool,the tool begins automated installation functions. Alternatively, wiredcommunications with the surface could be used to operate theinstallation tool via tether or umbilical. The system will allow formonitoring and control of all factors of installation, including but notlimited to crowd speed, rotational speed, pile angle, anchor level, etc.The various sensors may be used to determine holding capacity, and otherimportant properties.

If needed, the system may self-level by advancing or retracting specificpiles while holding others still. Once level, the tool can advance allof the helical piles into the seabed simultaneously.

The helical piles will pull the skirt and template into the seabead.Torque, crowd, and helical pile advancement rates are installationcomponents calculated and measured for installation operations.

Unique to the installation tool is the ability to provide the requiredtorque and crowd force to install each helical pile simultaneously.Capacity derived from installation torque requires a specificadvancement rate to achieve optimum holding force, generally >85% of thehelix pitch. This means that as each helical pile is installed, it mustadvance into the seafloor at least 85% of the pitch (vertical distanceof one revolution of the helix) to ensure over-flighting or augeringdoes not apply. This is controlled by providing enough crowd force.Crowd force ensures the helical pile has enough mass to resist theupward force of the soil on the helix at it is rotated into the seabed.The amount of crowd force that needs to be provided by the installationtool is approximately 1 kip per 1,000 ft-lb of installation torqueneeded.

The tool can be equipped with hydraulic actuators that have levelingfeet to support the direction the anchor is installed.

Once final torque is measured and the anchor capacity is correlated, thetool will lock the helical piles to the template and the tooldisconnects form the template and is recovered to deck.

The present disclosure is not to be limited in terms of the particularembodiments described in this application, which are intended asillustrations of various features. Many modifications and variations canbe made without departing from its spirit and scope, as will be apparentto those skilled in the art. Functionally equivalent methods andapparatuses within the scope of the disclosure, in addition to thoseenumerated herein, will be apparent to those skilled in the art from theforegoing descriptions. It is to be understood that this disclosure isnot limited to particular methods, reagents, compounds, compositions orbiological systems, which can, of course, vary. It is also to beunderstood that the terminology used herein is for the purpose ofdescribing particular embodiments only, and is not intended to belimiting.

With respect to the use of substantially any plural and/or singularterms herein, those having skill in the art can translate from theplural to the singular and/or from the singular to the plural as isappropriate to the context and/or application. The varioussingular/plural permutations may be expressly set forth herein for sakeof clarity.

It will be understood by those within the art that, in general, termsused herein are generally intended as “open” terms (for example, theterm “including” should be interpreted as “including but not limitedto,” the term “having” should be interpreted as “having at least,” theterm “includes” should be interpreted as “includes but is not limitedto,” et cetera). While various compositions, methods, and devices aredescribed in terms of “comprising” various components or steps(interpreted as meaning “including, but not limited to”), thecompositions, methods, and devices can also “consist essentially of” or“consist of” the various components and steps, and such terminologyshould be interpreted as defining essentially closed-member groups.

In addition, even if a specific number is explicitly recited, thoseskilled in the art will recognize that such recitation should beinterpreted to mean at least the recited number (for example, the barerecitation of “two recitations,” without other modifiers, means at leasttwo recitations, or two or more recitations). Furthermore, in thoseinstances where a convention analogous to “at least one of A, B, and C,et cetera” is used, in general such a construction is intended in thesense one having skill in the art would understand the convention (forexample, “a system having at least one of A, B, and C” would include butnot be limited to systems that have A alone, B alone, C alone, A and Btogether, A and C together, B and C together, and/or A, B, and Ctogether, et cetera). In those instances where a convention analogous to“at least one of A, B, or C, et cetera” is used, in general such aconstruction is intended in the sense one having skill in the art wouldunderstand the convention (for example, “a system having at least one ofA, B, or C” would include but not be limited to systems that have Aalone, B alone, C alone, A and B together, A and C together, B and Ctogether, and/or A, B, and C together, et cetera). It will be furtherunderstood by those within the art that virtually any disjunctive wordand/or phrase presenting two or more alternative terms, whether in thedescription, sample embodiments, or drawings, should be understood tocontemplate the possibilities of including one of the terms, either ofthe terms, or both terms. For example, the phrase “A or B” will beunderstood to include the possibilities of “A” or “B” or “A and B.”

In addition, where features of the disclosure are described in terms ofMarkush groups, those skilled in the art will recognize that thedisclosure is also thereby described in terms of any individual memberor subgroup of members of the Markush group.

As will be understood by one skilled in the art, for any and allpurposes, such as in terms of providing a written description, allranges disclosed herein also encompass any and all possible subrangesand combinations of subranges thereof. Any listed range can be easilyrecognized as sufficiently describing and enabling the same range beingbroken down into at least equal halves, thirds, quarters, fifths,tenths, et cetera. As a non-limiting example, each range discussedherein can be readily broken down into a lower third, middle third andupper third, et cetera. As will also be understood by one skilled in theart all language such as “up to,” “at least,” and the like include thenumber recited and refer to ranges that can be subsequently broken downinto subranges as discussed above. Finally, as will be understood by oneskilled in the art, a range includes each individual member. Thus, forexample, a group having 1-3 cells refers to groups having 1, 2, or 3cells. Similarly, a group having 1-5 cells refers to groups having 1, 2,3, 4, or 5 cells, and so forth.

The term “about,” as used herein, refers to variations in a numericalquantity that can occur, for example, through measuring or handlingprocedures in the real world; through inadvertent error in theseprocedures; through differences in the manufacture, source, or purity ofcompositions or reagents; and the like. Typically, the term “about” asused herein means greater or lesser than the value or range of valuesstated by 1/10 of the stated values, e.g., ±10%. The term “about” alsorefers to variations that would be recognized by one skilled in the artas being equivalent so long as such variations do not encompass knownvalues practiced by the prior art. Each value or range of valuespreceded by the term “about” is also intended to encompass theembodiment of the stated absolute value or range of values. Whether ornot modified by the term “about,” quantitative values recited in thepresent disclosure include equivalents to the recited values, e.g.,variations in the numerical quantity of such values that can occur, butwould be recognized to be equivalents by a person skilled in the art.

Various of the above-disclosed and other features and functions, oralternatives thereof, may be combined into many other different systemsor applications. Various presently unforeseen or unanticipatedalternatives, modifications, variations or improvements therein may besubsequently made by those skilled in the art, each of which is alsointended to be encompassed by the disclosed embodiments.

Embodiments

1. A system for installation of one or more piles, wherein the systemdrives anchors into the seabed at intermediate sections rather than fromthe top of the pile, wherein installation of the piles occurs subsea atdeep ocean depth with subsea tooling. Other embodiments are used atshallow depths.

2. The system of embodiment 1, wherein the one or more helical piles arein a single configuration.

3. The system of embodiment 1, wherein the one or more helical piles arein a group configuration.

4. The system of embodiment 1, wherein the helical piles secure afloating offshore asset.

5. The system of embodiment 1, wherein the helical piles secure a fixedoffshore asset.

6. The system of embodiment 1, wherein the installation uses standardoffshore vessel spreads.

7. The system of embodiment 1, wherein the system includes a subseahydraulic power unit.

8. The system of embodiment 1, wherein the system includes a topsidehydraulic power unit.

9. The system of embodiment 1, wherein the system includes subseacommunication bottles.

10. The system of embodiment 1, wherein the system includes offshorerated support structure/lifting points.

11. The system of embodiment 1, wherein the system includesself-leveling legs.

12. The system of embodiment 1, wherein the system includes anchordisconnection/alignment guides.

13. The system of embodiment 1, wherein the system includes modulardrive train systems.

14. The system of embodiment 12, wherein the modular drive train systemcomprises:

-   torque heads driven by motors, which may be hydraulic or electric,    motors attached drive to acme rods or linear actuator providing    downward force, and various monitoring sensors

15. The system of embodiment 1, wherein the intermediate sections are5-20 feet in length.

16. The system of embodiment 1, wherein the total installation length isover 100 feet.

17. The system of embodiment 1, wherein the total installation length isover 5 feet.

18. The system of embodiment 1, wherein the system additionallycomprises a group anchor which includes a skirt.

19. The system of embodiment 17, wherein the skirt is self-installing ormay be pulled in by the piles

20. The system of embodiment 1, wherein the piles are rigid helicalpiles.

21. The system of embodiment 1, wherein the piles are flexible helicalpiles.

22. The system of embodiment 1, additionally comprising an automatedinstallation process.

23. The system of embodiment 1, additionally comprising auser-controlled installation process.

24. A method of installing one or more piles, comprising:

-   -   driving anchors unto the seabed at intermediate sections rather        than from the top of the pile    -   wherein installation of the piles occurs subsea at deep ocean        depth with subsea tooling. Other embodiments are used at shallow        depths.

25. The method of embodiment 1, wherein the one or more helical pilesare in a single configuration.

26. The method of embodiment 1, wherein the one or more helical pilesare in a group configuration.

27. The method of embodiment 1, wherein the helical piles secure afloating offshore asset.

28. The method of embodiment 1, wherein the helical piles secure a fixedoffshore asset.

29. The method of embodiment 1, wherein the installing uses standardoffshore vessel spreads.

30. The method of embodiment 1, wherein the method includes a subseahydraulic power unit.

31. The method of embodiment 1, wherein the method includes subseacommunication bottles.

32. The method of embodiment 1, wherein the method includes offshorerated support structure/lifting points.

33. The method of embodiment 1, wherein the method includesself-leveling legs.

34. The method of embodiment 1, wherein the method includes anchordisconnection/alignment guides.

35. The method of embodiment 1, wherein the method includes modulardrive train methods.

36. The method of embodiment 25, wherein the modular drive train methodcomprises:

-   -   torque heads driven by hydraulic or electric motors,    -   hydraulic motors attached drive to acme rods or linear actuators        providing downward force, and    -   various monitoring sensors

37. The method of embodiment 1, wherein the intermediate sections are5-20 feet in length.

38. The method of embodiment 1, wherein the total installation length isover 100 feet.

39. The method of embodiment 1, wherein the total installation length isover 5 feet.

40. The method of embodiment 1, wherein the method additionallycomprises a group anchor which includes a skirt.

41. The method of embodiment 40, wherein the skirt is self-installing.

42. The method of embodiment 40, wherein the skirt is installed withadditional force provide by the installation tool.

43. The method of embodiment 1, wherein the helical piles are rigidhelical piles.

44. The method of embodiment 1, wherein the helical piles are flexiblehelical piles.

45. The method of embodiment 1, additionally comprising an automatedinstallation process.

46. The method of embodiment 1, additionally comprising auser-controlled installation process.

What is claimed is:
 1. An installation tool for installing a groupanchor system, wherein the group anchor system comprises at least twopiles, the installation tool comprising: a plurality of installationmodules, wherein each installation module comprises means for installinga pile from an intermediate point along the length of the pile.
 2. Theinstallation tool of claim 1, wherein each installation modulecomprises: a linear guide rail; a driver platform engaging the linearguide rail for movement thereon; wherein the drive platform includes adrive motor for driving a drive head for engaging and driving a pile;and a motor for inserting or removing a pile.
 3. The installation toolof claim 1, wherein each installation module comprise roller based drivesystem
 4. The installation tool of claim 1, wherein each of the at leasttwo piles is associate with a single module of the plurality ofinstallation modules or where more than one of the at least two piles isassociated with a single installation module.
 5. The installation toolof claim 1, wherein each installation module further comprises means forengaging and driving a pile from a point along its length, rather thanfrom an end.
 6. The installation tool of claim 1, wherein theinstallation tool is adapted for subsea use.
 7. The installation tool ofclaim 1, wherein the at least two piles are helical piles, and the drivemotor provides rotational force to drive a helical pile.
 8. Theinstallation tool of claim 1, wherein the two or more piles are flexiblepiles and the installation tool further comprises a plurality ofremovable installation tubes, each of which surrounds a flexible shaftof each flexible pile.
 9. The installation tool of claim 8, wherein theinstallation tube is provided with a plurality of lugs along its lengthfor mating with the drive head of the drive motor such that theinstallation tube, and thus the pile, is driven from a point along itslength rather than, or in addition to, its end.
 10. The installationtool of claim 8, wherein the installation tube comprises multiplesections, wherein adjacent sections are connected by a drive lug formating with the drlugsive head of the drive motor, such that theinstallation tool may be driven from any drive lug location, rather thanfrom the end.
 11. The installation tool of claim 1, wherein the tool isadapted for driving one or more piles that are rigid piles, wherein eachrigid pile has a plurality of lugs along its length for mating with thedrive head of the drive motor such that the pile is driven from a pointalong its length rather than, or in addition to, its end.
 12. Theinstallation tool of claim 1 wherein the plurality of installationmodules comprises 2-100 modules arranged in a predetermined pattern withrespect to each other and each corresponding to a location of a pile tobe driven.
 13. The installation tool of claim 1, comprising a controlsystem permitting manual, semi-automatic, or automatic driving of eachmodule independently or simultaneously.
 14. A system for installation ofone or more piles, wherein the system drives piles into the seabed atintermediate points rather than from the top of the pile, whereininstallation of the piles occurs subsea at deep ocean depth with subseatooling.
 15. The system of claim 4, wherein the one or more piles arehelical piles.
 16. A method of installing a group anchor systemcomprising two or more piles, the method comprising: providing amulti-module installation tool in accordance with claim 1, whereininstallation of the piles occurs subsea at ocean depth with subseatooling.
 17. The method of claim 16, wherein the one or more piles arein a group configuration.
 18. The method of claim 6, wherein each modulecomprises one or more of: torque heads driven by motors, motors attacheddrive head to provide downward force, and various monitoring sensors.19. The method of claim 16, additionally comprising an automatedinstallation process.
 20. The method of claim 16, additionallycomprising a user-controlled installation process.
 21. The method ofclaim 16, wherein each module may be operated simultaneously orindependently, or in group to facilitate leveling of the group anchorsystem.
 22. The method of claim 16, wherein each of the piles is ahelical pile.
 23. The method of claim 16, wherein pile rotation andvertical motion are precisely controlled to achieve optimum soilinteraction to obtain desired performance.
 24. The method of claim 16,wherein the group anchor system comprises a template through which thepiles are driven and a skirt projecting toward the seabed from thetemplate, wherein driving the piles into the seabed pulls the groupanchor system into the seabed to a desired depth, angle, and position,wherein the method provides for withdrawing the piles to leave thetemplate and skirt in place.
 25. A group anchor system comprising: aplurality of piles; a template, wherein the template defines an aperturefor each of the plurality of piles allowing the pile to passtherethrough and to be secured therein; and a mooring connection. 26.The group anchor system of claim 25, further comprising a skirt fixed tothe perimeter of the template and extending therefrom towards theseabed.
 27. The group anchor system of claim 6, wherein the skirtextends either perpendicularly, or at an outward angle from thetemplate.
 28. The group anchor system of claim 26, wherein one or moreof the plurality of piles may be provided with an inner skirt,associated therewith.
 29. The group anchor system of claim 26, whereineach pile is a helical pile.
 30. The group anchor system of claim 26,further comprising a load distribution system for distributing the loadsfrom the piles across the system.